Question

which luminous substance is in a thermometer?
(1) gold
(2) silver
(3) mercury
(4) Aluminium​

Answer 1

Mercury

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Answer 2

(3) Mercury is in the thermometer.

• Mercury is filled in glass tubes to be used as a thermometer. The application is based on expanding and contracting mercury depending on the heat in the environment.

• The markings or readings on the glass tube state the temperature.

• A luminous substance is defined as a substance that emits light on its own. A natural example of a luminous object is the sun while the artificial or man-made example of a luminous object is the bulb, torch, etc.

• Application of gold is in jewellery making, as an alloy to increase the hardness of base metals etc.

• The application of silver is also in jewellery making, mirrors, alloys, electrical components, etc.

• Aluminium is generally used in the production of utensils, window frames, etc.

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